05000302/LER-1978-069-03, /03L-0 on 781213:while Performing Surveillance procedure,RB3-GP-2,light Did Not Illuminate When Circuit Was Tested.Relay L in Engineered Safeguards Cabinet C-4 Was de-energized,but Stuck Plunger Was in Energized Position

/03L-0 on 781213:while Performing Surveillance procedure,RB3-GP-2,light Did Not Illuminate When Circuit Was Tested.Relay L in Engineered Safeguards Cabinet C-4 Was de-energized,but Stuck Plunger Was in Energized Position

ML19256A849
Person / Time
Site:	Crystal River
Issue date:	12/13/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A847	List: 05000302/LER-1978-069, Forwards LER 78-069/03L-0 05000302/LER-1978-069-03, /03L-0 on 781213:while Performing Surveillance procedure,RB3-GP-2,light Did Not Illuminate When Circuit Was Tested.Relay L in Engineered Safeguards Cabinet C-4 Was de-energized,but Stuck Plunger Was in Energized Position
References
LER-78-069-03L, LER-78-69-3L, NUDOCS 7901160232
Download: ML19256A849 (2)

LER-1978-069, /03L-0 on 781213:while Performing Surveillance procedure,RB3-GP-2,light Did Not Illuminate When Circuit Was Tested.Relay L in Engineered Safeguards Cabinet C-4 Was de-energized,but Stuck Plunger Was in Energized Position

Event date:
Report date:
3021978069R03 - NRC Website

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svENT orscRinnoN ANo *ResAsts ccNsscusNcss o 2 i At 1100 v'111e performing Survei ance Procedure SP-130, it was observed that, mi the RB3-GP-2 light did not illuminate when circuit was tested.

Investigatiop,

Irevealed that relay "L" in engineered safeguards cabinet C-4 was de-energized o 6.

o s I but the plunger was in the energized position. Channel redundancy was

reduced contrary to Technical Specification 3.3.2.1.

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The relay was sprayed with aa approved cleaner and the plunger, m I returned to the de-enercized nosition.

Onerability was checked several timet 3 l and found accentable.

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SUPPLEMENTARY INFORMATION 1.

Report No.:

50-302/78-069/03L-0 2.

Facility:

Crystal River Unit #3 3.

Report Date:

8 January 1979 4.

Occurrence Date:

13 December 1978 5.

Identification of Occurrence:

One inoperable engineered safety feature e,*uation system instrument channel contrary to Technical Specification 3.3.f 6.

Conditions Prior te Occurrence:

l'ade 1 power operation (99%).

7.

Description of Occurrence:

At 1100 while performing Surveillance Procedure SP-130, Engineered Safeguards Monthly Functional Test, it was observed that the Reactor Building channel three, group two (RB3-GP-2) light did not illuminate when the circuit was tested.

Investi-gation revealed that the contects were open on relay "L" in engineered safeguards cabinet C-4.

The relay was de-energized but the plunger was stuck in the energized position. This conditiot. would have prevented channel 3 actuation of two nuclear services closed cycle cooling valves, SWV-81 and 85.

Operability of channel three was promptly restored and testing continued.

8.

Designation of Apparent Cause:

The cause of this event was found to be a stuck plunger in relay "L",

cabinet C-4.

9.

Analysis of Occurrence:

There was no hazard to plant or general public as the affected channel was in a test mode. The remaining two channels were operable.

10.

Corrective Action

The plunger in relay "L" was sprayed 71th an approved cleaner. Plunger returned to the de-engergized position. Relay operability was checked several times and found to be acceptable.

11.

Failure Data:

Two similar occurrences previously reported but first occurrence of this type.

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